<div class="container">
<span class="col-sm-12">
  <a  href="#" class="btn btn-primary btn-lg" ng-show="show=='logged-out'" ng-click="login()">Login</a>
  <a  href="#" class="btn btn-primary btn-lg"     ng-show="show=='denied'"     ng-click="login()">Access denied. Try again.</a>
  <a  href="#" class="btn btn-primary btn-lg"     ng-show="show=='logged-in'"     ng-click="logout()">Logout.</a>
</span>
</div>